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Related Experiment Videos

Lightness, equivalent backgrounds, and anchoring

N Bruno1, P Bernardis, J Schirillo

  • 1Dipartimento di Psicologia, Università di Trieste, Italy. nicola.bruno@univ.trieste.it

Perception & Psychophysics
|July 1, 1997
PubMed
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Researchers studied how lightness perception is affected by surrounding colors. Findings suggest that the highest luminance in a surround configuration is crucial for determining equivalent backgrounds, impacting lightness models.

Area of Science:

  • Visual perception
  • Computational neuroscience
  • Color science

Background:

  • Lightness perception is influenced by the luminance of surrounding areas.
  • Understanding equivalent backgrounds is key to modeling visual systems.
  • The anchoring problem in lightness perception remains a challenge.

Purpose of the Study:

  • To compare two center/surround configurations for assessing lightness perception.
  • To identify luminance conditions that create equivalent backgrounds.
  • To evaluate existing computational models of lightness.

Main Methods:

  • Haploscopic comparison of two center/surround visual display configurations.
  • Systematic variation of luminance in surround surfaces and annuli.

Related Experiment Videos

  • Identification of luminance values resulting in perceived equivalent backgrounds.

    • Main Results:

    • Equivalent backgrounds were achieved when the center surface luminance matched the highest luminance in a multi-surface surround.
    • A single annulus surround configuration showed similar results to multi-surface surrounds.
    • Models based on space-average luminance or contrast provided weaker fits to the data.

    Conclusions:

    • The highest luminance in the surround is a critical factor for lightness perception.
    • Findings offer insights for refining computational models of lightness.
    • Results contribute to understanding and solving the anchoring problem in vision.